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Ontogeny of Excitatory Spinal Neurons Processing Distinct Somatic Sensory Modalities

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Ontogeny of Excitatory Spinal Neurons Processing Distinct Somatic Sensory Modalities 14738 • The Journal of Neuroscience, September 11, 2013 • 33(37):14738–14748 Development/Plasticity/Repair Ontogeny of Excitatory Spinal Neurons Processing Distinct Somatic Sensory Modalities Yi Xu,1* Claudia Lopes,1* Hagen Wende,2 Zhen Guo,3 Leping Cheng,3 Carmen Birchmeier,2 and Qiufu Ma1 1Dana-Farber Cancer Institute and Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, 2Department of Neuroscience, Max Delbru¨ck Center, 13125 Berlin, Germany, and 3Institute of Neuroscience, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China Spatial and temporal cues govern the genesis of a diverse array of neurons located in the dorsal spinal cord, including dI1-dI6, dILA , and dILB subtypes, but their physiological functions are poorly understood. Here we generated a new line of conditional knock-out (CKO) mice, in which the homeobox gene Tlx3 was removed in dI5 and dILB cells. In these CKO mice, development of a subset of excitatory neurons located in laminae I and II was impaired, including itch-related GRPR-expressing neurons, PKC␥-expressing neurons, and neurons expressing three neuropeptide genes: somatostatin, preprotachykinin 1, and the gastrin-releasing peptide. These CKO mice displayed marked deficits in generating nocifensive motor behaviors evoked by a range of pain-related or itch-related stimuli. The mutants also failed to exhibit escape response evoked by dynamic mechanical stimuli but retained the ability to sense innocuous cooling and/or warm. Thus, our studies provide new insight into the ontogeny of spinal neurons processing distinct sensory modalities. Introduction from progenitors expressing the transcription factor Olig3, The dorsal horn of the spinal cord processes diverse somatic sen- and (2) Lbx1-expressing class B neurons, derived from Olig3- sory information, including pain, itch, touch, cold, and warm negative progenitors (see Fig. 1A)(Gross et al., 2002; Mu¨ller et al., (Craig, 2003; Todd, 2010). Early electrophysiological and mor- 2002, 2005). Class B neurons are further divided into glutamater- phological studies suggest the existence of modality selective gic excitatory neurons (dI5 and dILB) marked by the expression spinal neurons (Christensen and Perl, 1970; Han et al., 1998), of the homeobox proteins Lmx1b and Tlx3, and GABAergic/ which is further supported by recent cell ablation and behav- glycinergic inhibitory neurons (dI4, dI6, and dILA) marked by the ioral studies (Sun et al., 2009; Mishra et al., 2012; Mishra and expression of the homeobox proteins Pax2 and Lhx2/9 (Gross et Hoon, 2013). For example, neurons expressing the gastrin- al., 2002; Mu¨ller et al., 2002; Qian et al., 2002; Helms and John- releasing peptide receptor (GRPR) or the natriuretic polypep- son, 2003; Cheng et al., 2004, 2005; Glasgow et al., 2005; Rebelo et tide b receptor (Npra) are required to sense itch, but not pain al., 2010). (Sun et al., 2009; Mishra and Hoon, 2013). However, how Previously, we and others reported that the Tlx3 homeobox modality-selective spinal neurons emerge during develop- gene is necessary for proper development of dI3, dI5, and dILB ment is still poorly understood. excitatory neurons in the dorsal spinal cord, including specifica- Early during development, eight groups of molecularly dis- tion of the glutamatergic and peptidergic transmitter phenotypes tinct dorsal horn neurons have been identified, namely, dI1-dI6, (Qian et al., 2002; Cheng et al., 2004; Xu et al., 2008; Guo et al., dILA, and dILB (Gross et al., 2002; Mu¨ller et al., 2002; Helms and 2012). A recent study shows that class A dI3 neurons are involved Johnson, 2003) (see Fig. 1A). Based on differential expression of with sensory motor coordination, such as hand grasp (Bui et al., the homeodomain protein Lbx1, they are divided into (1) Lbx1- 2013). The focus of this study, however, is the physiological func- negative class A excitatory neurons (dI1–3), which are derived tions of class B dI5 and dILB neurons, which are still unknown. Genetic fate mapping shows that the majority of Tlx3 lineage neurons are enriched in superficial laminae (I-III), although also Received Nov. 29, 2012; revised Aug. 3, 2013; accepted Aug. 7, 2013. scattered throughout the ventral laminae (Xu et al., 2008). Be- Author contributions: Y.X., C.L., Z.G., L.C., and Q.M. designed research; Y.X., C.L., Z.G., L.C., and Q.M. performed research; H.W. and C.B. contributed unpublished reagents/analytic tools; Y.X., C.L., Z.G., L.C., and Q.M. analyzed cause dI3 neurons are enriched in the deep dorsal horn (Helms data; Y.X., C.L., L.C., C.B., and Q.M. wrote the paper. and Johnson, 2003; Bui et al., 2013), it can be certain that those The work done in the Q.M. laboratory was supported by the National Institutes of Health, National Institute of Tlx3 lineage neurons located in the superficial laminae must be Neurological Disorders and Stroke Grant R01NS047710. We thank Dr. Silvia Arber for the Tau-loxp-STOP-lox-mGFP- derived from dI5 and dIL neurons. Superficial laminae normally IRES-NLS-LacZ reporter mice; Dr. Jean-Francois Brunet for the Phox2a antibody; and Drs. Clifford Woolf, Wendy B Knowlton, Fu-Chia Yang, and Bo Duan for critical discussions and comments. receive inputs from primary sensory afferents that transmit The authors declare no competing financial interests. pain-, itch-, and temperature-related sensory information *Y.X. and C.L. contributed equally to this work. (Todd, 2010). To determine to what degree dI5 and dILB neurons Correspondence should be addressed to Dr. Qiufu Ma, Dana-Farber Cancer Institute and Department of Neuro- process these types of somatic sensory information, here we used biology, Harvard Medical School, 1 Jimmy Fund Way, Boston, MA 02115. E-mail: [email protected]. DOI:10.1523/JNEUROSCI.5512-12.2013 Lbx1-Cre mice (Sieber et al., 2007) to selectively remove Tlx3 in Copyright © 2013 the authors 0270-6474/13/3314738-11$15.00/0 these neurons. Subsequent histochemical and behavioral analy- Xu, Lopes et al. • Excitatory Spinal Neurons and Somatic Sensory Modalities J. Neurosci., September 11, 2013 • 33(37):14738–14748 • 14739 ses provide new insight into the ontogeny of spinal neurons pro- Capsaicin was intradermally administrated in a dosage of 2.5 ␮g/10 ␮l cessing distinct types of somatic sensory modalities. into the right hindpaw, and the duration of lifting, licking, and flinching was measured. To measure sensitivity to noxious cold, the cold plate Materials and Methods (IITC) was set to 0°C. The mice were video-recorded for 120 s, and the Animals. The generation of mice carrying the Tlx3 conditional null allele combined number of hindpaw flicking, licking, or jumping was (Tlx3F/ϩ), the Lbx1cre mouse line, the Tlx3Cre mice, and the Tau-loxp- measured. STOP-lox-mGFP-IRES-NLS-LacZ reporter line had been described pre- For the temperature chamber assay, animals were allowed to explore viously (Hippenmeyer et al., 2005; Sieber et al., 2007; Xu et al., 2008; adjacent surfaces, with one held at 20°C and the other ranging from 30°C Lopes et al., 2012). In all timed matings, the morning that vaginal plugs to 5°C. The mice were video-recorded for 5 min, and the percentages of were observed was considered to be E0.5. Genotypes were identified by time staying at 20°C chamber were determined. The acetone evaporation PCR analysis of genomic DNA extracted from mouse tail tissue, and the cooling assay was performed as previously described (Knowlton et al., following PCR primers were used to identify the floxed and deleted Tlx3 2011) with some modifications. Mice were acclimated for 10 min in an alleles:5Ј-TGTTTCGCCTCCTTTGCTCG-3Јand5Ј-GTTGGATGGAAG elevated wire grid. A syringe with a piece of rubber tubing attached to the CAAAGATAG-3Ј. For histochemical studies, mice at P28 or younger end was filled with acetone and the plunger depressed so that a small drop ages were used. For behavioral analyses, mutant and control littermates of acetone formed at the top of the tubing. The syringe was raised to the at P21-P28 were used. All animal procedures are contained in protocols hindpaw from below, depositing the acetone drop on the paw. The test reviewed and approved by the Animal Care and Use Committees at the was repeated for 10 times (5 times for each paw), with intervals of 3 min. Dana-Faber Cancer Institute. Both males and females were used for the Responses were video-recorded, and duration times of lifting, licking, studies. flinching, shacking, and rotating on the torso were determined. To mea- In situ hybridization and immunostaining. Detailed methods for single- sure punctate mechanical sensitivity, we placed animals on an elevated color in situ hybridization and in situ hybridization combined with flu- wire grid and the lateral plantar surface of the hindpaw stimulated with orescent immunostaining had been described previously (Liu et al., calibrated von Frey monofilaments (0.0174–4.57 g). The paw with- 2010). The following in situ probes were described previously, including drawal threshold for the von Frey assay was determined using Dixons SOM, Tac1, VGLUT2, and GRPR (Cheng et al., 2004; Xu et al., 2008). up-down method (Chaplan et al., 1994). To measure dynamic mechan- GRP in situ probe was amplified with gene-specific sets of PCR prim- ical sensitivity, the middle part of the right hindpaw was stimulated by ers and cDNA template prepared from postnatal day 0 (P0) mouse light stroking with a cotton swab, in the direction from heel to toe. The spinal cords with a final fragment size of 0.387 kb. The following test was repeated three times, with intervals of 10 seconds. For each test, antibodies were used for single or double immunostaining: rabbit a score of 0 indicates no movement, and a score of 1 is a lifting of the anti-Pax2 (1:500, Zymed Laboratories), rabbit anti-VGLUT1 (1:1000, stimulated paw and/or walking way.
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